[Proj] Info on proj4 formulas

[Norman Vine]

On May 9, 2014, at 10:05 AM, Andrea Peri <aperi2007 at gmail.com> wrote:

> Hi,
> You have right.
> I can read and try to understand the code but i don't know the PROJ lib.  There is a specific file source dedicate to the reprojection functions ?
> 
> 

Each projection has its own file these are named  "PJ_XXXX"
where XXXX is an abbreviation of the projection's name

Proj4 is the codification of Snyder's "Map Projections: A Working Manual"
Where the derivation of the projections are discussed
this is available as a pdf from
http://pubs.er.usgs.gov/publication/pp1395

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